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Proceedings Paper

Optical encryption system using a spatial light modulator
Author(s): G. Unnikrishnan; Joby Joseph; Kehar Singh
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Paper Abstract

We implemented an optical encryption system that uses random Fourier plane encoding as the encryption method. In this method, data is encrypted by using a random phase function in the Fourier plane. In the earlier systems, the random phase function has been mostly implemented by fabricating random phase mask using photolithographic technique or by photographic bleaching process. We implement the binary random phase function using a Ferroelectric spatial light modulator (SLM). The use of SLM eliminates the need of fabricating the random phase mask which makes the SLMs suitable candidates in the encryption systems. The encrypted image which is a complex function is holographically recorded in a photorefractive BaTiO3 crystal.

Paper Details

Date Published: 7 May 1999
PDF: 4 pages
Proc. SPIE 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), (7 May 1999); doi: 10.1117/12.347734
Show Author Affiliations
G. Unnikrishnan, Indian Institute of Technology/Delhi (India)
Joby Joseph, Indian Institute of Technology/Delhi (India)
Kehar Singh, Indian Institute of Technology/Delhi (India)

Published in SPIE Proceedings Vol. 3740:
Optical Engineering for Sensing and Nanotechnology (ICOSN '99)
Ichirou Yamaguchi, Editor(s)

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